Retort



June 17, 1930. s, CHADwlCK ET AL 'RETORT Filed rawh 1'? 1928 IhmentomrMw Nm Q,

M www Patented June 17, v1930Y UNITED* STATES .PATENT CFI-ICE LEE S.CHADWICK, or SHAKER HEIGHTS, ANEMAEC EEsEiLoE CLEVELAND HEIGHTS, oHIo,ASSIGNoES rro PEEEECTVION sToVE COMPANY, 0E CLEVELAND, oHro, A ConfPoEATIoN 0E oHIo ApplicationY md Marcily 17, 192s.` serial No. 262,580.

This invention relates, generally, to improvements inf liquid fuelburners of the retort class, and more especially to improvements in theretorts or generators used in 5 conjunction with such burners.v 1

For illustrative purposes we have herein disclosed our vinvention asembodied in the type of retort used in liquid fuel cook stoves,examples'ofwhich will be found in our copending applications Serial Nos.126,366and andDecember 6, 1926. The present invention is applicable,however, to different types or styles of retorts so long as` they arecharacterized by a hollow body enclosing a generating chamber and havinga threadedbore leading therefrom to a gas emitting orifice, and athreaded stem operating lwithin said bore, the stem, in most cases,carrying an axial needle for rvcooperation with the orifice; there,being a passageway through which the gas escapes from the generatingchamber along the threaded portion of the stem to the' orifice. y

Heretofore, with retorts of this character, spasmodic sputterings andspurtings of liquid hydrocarbon have attended their 0peration whichinterfere greatly with the action of the` main burner toV which -gas issupplied by the retort, reducing the efficiency of said burner Vandcausing incomplete combustion-and effecting red streaks in the flame. Itwas discovered that this trouble occurred only under certain adjustmentsof the retort control stem, and upon close investigation it wasascertained that the difficulty arose when the straight passageway orchannel heretofore cut or Ymilled along the threaded portion of the stemfor the passage of gas from the generating chamber to the orifice was ator near the bottom side of the bore wherein the spindle operates. Underthese conditions, small bubbles or drops of the liquid hydrocarbon whichreached the forward end of the generating chamber escaped through thepas.-

sageway and issued from the orifice in un-V Vaporized condition, causingthe undesirable effects aboveV described.

It is the purpose of our` present invention 152,798, filed,respectively, August 2, 1926,A

to obviate this difliculty byA substituting forA the heretoforestraight, longitudinal passageway or channel in the threaded portion ofthe stem, a passageway of such shape,

character or location as will compel the fuelV expelledfrom thegenerating' chamber to travel upwardly to, or rise toward, the upperportion ofthe bore whereinthe stem operates before reaching vthe gasemitting orifice. It is found that this very effectively prevents liquidhydrocarbon from escaping from the generating chamber and reaching thegas'emitting orifice of therretort before itis thoroughly broken up `andvaporized.

An embodiment of the invention is Villustrated in the accompanyingdrawing wherein Fig. 1 is a fragmentary sectional elevation of a stoveincorporating our improved retort; Fig. 2 is an enlarged longitudinalsection through the retort; and Fig. 3 is fa transverse section on theline 3-3 of Fig. 2. The stove structure wherewith we have associated ourinvention for the purpose of the present .disclosure includes a top 1and a Vertical panel 2, and suitably supported beneath Vthe top 1 is amanifold 3 which has connection with a burner 4 thatis situated below anopening 5 inthe stove top, all of which is in accordance with commonpractice. Shown as formed integral with the manifold 3 is a mixer 8; andrising along-the outer side of thepanel 2 is a fuel supply Pire 9- The'retort, which is designated generally by the reference numeral 10, is inthe form of a long tubular body that is adapted to Vbe projected throughan aperture inthe panel 2 and across the burner 4 and have vitsdischarge end extended through an opening Aprovided for the purpose inthe end wall of the body 12, and forwardly of said chamber the body isreduced in diameter and is formed with an axial bore 17 that isinternally threaded from its junction with the chamber 1G throughout amaterial portion of its length, as indicated at 18. The extreme forwardend of said bore is also threaded for the reception of a cap 19 having aport 2O that converges forwardly adjacent its outer end where itterminates in a reduced portion 21 that constitutes the gas Vemittingorifice of the retort. Intermediate its threaded portions, the bore 17is restricted by an annular wall 22, the rear face of which is beveledto constitute a valve seat 23. Within the threaded portion 18 of thebore 17 operates the threaded portion 24 of a stem 25 formed, a suitabledistance forwardly of its threaded portion, to provide a valve 26 thatcooperates with the seat 23, and extending axially from the forward endof said stem is a needle 27 which is adapted to enter the port 2O and,by coo aeration with the tapered portion thereof and with the orilice21, control the passage of gas through said orifice. The valve 26 isutilized to positively shut off the flow of gas from the retort, whende- Sired.

A spiral groove or channel 30 is milled or otherwise formed about thestem 25 in the region of its threaded portion 24 to provide a passagewayfor the escape of gas from the generating chamber to the gas emittingorifice 21. By so forming the passageway, the hydrocarbon is compelledto rise a material distance above the bottom portion of the bore whereinthe stem operates and in so doing any which may escape from the generating chamber in liquid condition is broken up and thoroughlyvaporized.

lVhere the stem 25 extends outwardly through the rear Vend of the head13, the joint between the stem and head is closed by the usual packinggland 32; and the stem is equipped beyond the head with an operatinghandle 33.

Having thus described our invention, what we cla-im is:

1. A retort comprising a substantially horizontally disposed, elongatedhollow body enclosing a generating chamber `and having a threaded boreleading therefrom, and a stem having a. threaded portion operatingwithin said bore, there being a passageway,

between opposed surfaces of the stem and body that leads past thethreaded portion of the stem and extends diagonally of the threads andat least a part of which passageway is at all times a material distanceabove the bottom of the bore irrespective of the adjustment of the stem.

2. A retort comprising a substantially horizontally disposed, elongatedhollow body enclosing a generating chamber and having a threaded boreleading therefrom, and a stem having a threaded portion operating withinsaid bore, there being a passageway between opposed surfaces of the stemand body that leads past the threaded portion of the stem and extendsdiagonally of the threads and is inclined with respect to the axis ofthe bore.

3. A retort comprising a substantially horizontally disposed, elongatedhollow body enclosing a'generating chamber and having a threaded boreleading therefrom, and a stem having a threaded portion operating'within said bore, there being a spiral passageway between opposedsurfaces of the stem and body that leads past the threaded portion ofthe stem and is of considerably greater pitch than the threads.

4;. A retort comprising a substantially horizontally disposed, elongatedhollow body enclosing a generatingchamber and having a'threaded boreleading therefrom, and a stem having a threaded portion operating withinsaid bore, the stem having a groove in its threaded portion that isinclined to its and cuts diagonally through the threads.

5. A retort comprising a substantially horizontally disposed, elongatedhollow body enclosing a generating chamber and having a threaded boreleading therefrom, and a stem having a threaded portion operating withinsaid bore, the stem having a spiral groove about its threaded portionthat is of considerably greater pitch than the threads.

In testimony whereof, we hereunto affix our signatures.

LEE S. CHADWICK. MARC RESEK.

